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ACCOUNTS RECEIVABLE FROM/PAYABLE TO RELATED ENTITIES (Details)	12 Months Ended
	Dec. 31, 2020
ACCOUNTS RECEIVABLE FROM/PAYABLE TO RELATED ENTITIES [Abstract]
Transaction terms and nature of settlement, description	The transaction terms for the Liabilities of the period 2021 correspond from 30 days to 1 year of maturity, and the nature of the settlement of transactions are monetary.

X

- Definition

Description of related party transaction terms and nature of settlement

+ References

No definition available.

+ Details

Name:	ltm_RelatedPartyTransactionTermsAndNatureOfSettlementDescription
Namespace Prefix:	ltm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_AccountsReceivableAdditionalDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration